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Phylogenetic tools and methods involving splits and matrix rank

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Python package which implements split- and rank-based tools for inferring phylogenies, such as flattenings and subflattenings.


The latest version of SplitP can be installed via the command pip install splitp


Import splitp and the associated helper functions

import splitp as sp
from splitp import tree_helper_functions as hf

Define trees and work with splits

splits = list(hf.all_splits(4))     # [01|23, 02|13, 03|12]
tree = sp.NXTree('((0,1),(2,3));')	
true_splits = tree.true_splits()    # 01|23

Let site patterns evolve under any submodel of the general markov model.

JC_subs_matrix = tree.build_JC_matrix(branch_length:=0.05)
pattern_probs = tree.get_pattern_probabilities()
>             0         1
      0    AAAA  0.185844
      1    AAAC  0.003262
      ..    ...       ...
      254  TTTG  0.003262
      255  TTTT  0.185844

Simulate sequence alignments from pattern distributions

pattern_frequencies = tree.draw_from_multinomial(pattern_probs, 100)
>         0    1
    0  AAAA  0.22
    1  AAAC  0.01
    ..  ...   ...
    2  CCGC  0.03
    3  TTTT  0.14

Reconstruct trees using split based methods including flattenings:

F1 = tree.flattening('01|23', pattern_frequencies)
F2 = tree.flattening('02|13', pattern_frequencies)
print(tree.split_score(F1) < tree.split_score(F2))    # True

Or subflattenings:

SF = tree.signed_sum_subflattening('01|23', pattern_probs)
print(tree.split_score(SF))   # 0.0

For more functionality please see the documentation at

Please see for information on contributing to this project.

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